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public class Solution {
    public int missingNumber(int[] nums) {
        
        Arrays.sort(nums);
        int start = 0, end = nums.length -1;
         
        while(start <= end){
            
            int mid = (end + start) / 2;
            if (mid == nums[mid]){
                start = mid + 1;
            }else{
                end = mid - 1;
            }          
        } 
        return start ;  
    }
}